A library that provides an embeddable, persistent key-value store for fast storage.
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Yanqin Jin 6ce5580882 Improve memtable earliest seqno assignment for secondary instance (#5413)
Summary:
In regular RocksDB instance, `MemTable::earliest_seqno_` is "db sequence number at the time of creation". However, we cannot use the db sequence number to set the value of `MemTable::earliest_seqno_` for secondary instance, i.e. `DBImplSecondary` due to the logic of MANIFEST and WAL replay.
When replaying the log files of the primary, the secondary instance first replays MANIFEST and updates the db sequence number if necessary. Next, the secondary replays WAL files, creates new memtables if necessary and inserts key-value pairs into memtables. The following can occur when the db has two or more column families.
Assume the db has column family "default" and "cf1". At a certain in time, both "default" and "cf1" have data in memtables.
1. Primary triggers a flush and flushes "cf1". "default" is **not** flushed.
2. Secondary replays the MANIFEST updates its db sequence number to the latest value learned from the MANIFEST.
3. Secondary starts to replay WAL that contains the writes to "default". It is possible that the write batches' sequence numbers are smaller than the db sequence number. In this case, these write batches will be skipped, and these updates will not be visible to reader until "default" is later flushed.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5413

Differential Revision: D15637407

Pulled By: riversand963

fbshipit-source-id: 3de3fe35cfc6f1b9f844f3f926f0df29717b6580
2019-06-10 12:58:14 -07:00
buckifier Add support for loading dynamic libraries into the RocksDB environment (#5281) 2019-06-03 23:02:56 -07:00
build_tools Remove special characters from job names (#5424) 2019-06-06 17:33:53 -07:00
cache simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
cmake Make FindZLIB consistent with official definitions (#4823) 2019-01-02 12:49:57 -08:00
coverage Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
db Improve memtable earliest seqno assignment for secondary instance (#5413) 2019-06-10 12:58:14 -07:00
docs Text lint all .gitignore files 2019-05-15 11:37:27 -07:00
env Fix build errors regarding const qualifier being ignored on cast result type (#5432) 2019-06-07 19:37:41 -07:00
examples simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
file simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
hdfs Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
include/rocksdb simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
java Move some logging related files to logging/ (#5387) 2019-05-31 17:23:59 -07:00
logging simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
memory Move some logging related files to logging/ (#5387) 2019-05-31 17:23:59 -07:00
memtable simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
monitoring simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
options simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
port Move some logging related files to logging/ (#5387) 2019-05-31 17:23:59 -07:00
table Revert to checking the upper bound on a per-key basis in BlockBasedTableIterator (#5428) 2019-06-07 15:17:05 -07:00
test_util simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
third-party/gtest-1.7.0/fused-src/gtest remove bundled but unused fbson library (#5108) 2019-03-26 16:37:52 -07:00
tools simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
trace_replay Add block cache tracer. (#5410) 2019-06-06 11:24:39 -07:00
util simplify include directive involving inttypes (#5402) 2019-06-06 13:56:07 -07:00
utilities WritePrepared: reduce prepared_mutex_ overhead (#5420) 2019-06-10 11:53:31 -07:00
.clang-format A script that automatically reformat affected lines 2014-01-14 12:21:24 -08:00
.gitignore Add support for loading dynamic libraries into the RocksDB environment (#5281) 2019-06-03 23:02:56 -07:00
.lgtm.yml Create lgtm.yml for LGTM.com C/C++ analysis (#4058) 2018-06-26 12:43:04 -07:00
.travis.yml Fix printf formatting on MacOS (#4533) 2018-10-19 14:46:09 -07:00
appveyor.yml Add RocksJava build to AppVeyor 2019-01-03 10:44:44 -08:00
AUTHORS Update RocksDB Authors File 2017-10-18 14:42:10 -07:00
CMakeLists.txt Add block cache tracer. (#5410) 2019-06-06 11:24:39 -07:00
CODE_OF_CONDUCT.md Add Code of Conduct 2017-12-05 18:42:35 -08:00
CONTRIBUTING.md Add Code of Conduct 2017-12-05 18:42:35 -08:00
COPYING Add GPLv2 as an alternative license. 2017-04-27 18:06:12 -07:00
DEFAULT_OPTIONS_HISTORY.md options.delayed_write_rate use the rate of rate_limiter by default. 2017-05-24 09:58:24 -07:00
defs.bzl Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
DUMP_FORMAT.md First version of rocksdb_dump and rocksdb_undump. 2015-06-19 16:24:36 -07:00
HISTORY.md Improve memtable earliest seqno assignment for secondary instance (#5413) 2019-06-10 12:58:14 -07:00
INSTALL.md Update the version of the dependencies used by the RocksJava static build (#4761) 2018-12-18 20:25:43 -08:00
issue_template.md Add a template for issues 2017-09-29 11:41:28 -07:00
LANGUAGE-BINDINGS.md LANGUAGE-BINDINGS.md: mention python-rocksdb 2019-03-20 11:10:48 -07:00
LICENSE.Apache Change RocksDB License 2017-07-15 16:11:23 -07:00
LICENSE.leveldb Add back the LevelDB license file 2017-07-16 18:42:18 -07:00
Makefile Add block cache tracer. (#5410) 2019-06-06 11:24:39 -07:00
README.md Add LevelDB repository link in the Readme 2019-04-01 18:19:09 -07:00
ROCKSDB_LITE.md Fix some typos in comments and docs. 2018-03-08 10:27:25 -08:00
src.mk Add block cache tracer. (#5410) 2019-06-06 11:24:39 -07:00
TARGETS Add support for loading dynamic libraries into the RocksDB environment (#5281) 2019-06-03 23:02:56 -07:00
thirdparty.inc Add copyright headers per FB open-source checkup tool. (#5199) 2019-04-18 10:55:01 -07:00
USERS.md Adding IOTA Foundation to USERS.MD (#4436) 2018-10-02 10:03:46 -07:00
Vagrantfile Adding CentOS 7 Vagrantfile & build script 2018-02-26 15:27:17 -08:00
WINDOWS_PORT.md #5145 , rename port/dirent.h to port/port_dirent.h to avoid compile err when use port dir as header dir output (#5152) 2019-04-04 11:38:19 -07:00

RocksDB: A Persistent Key-Value Store for Flash and RAM Storage

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RocksDB is developed and maintained by Facebook Database Engineering Team. It is built on earlier work on LevelDB by Sanjay Ghemawat (sanjay@google.com) and Jeff Dean (jeff@google.com)

This code is a library that forms the core building block for a fast key value server, especially suited for storing data on flash drives. It has a Log-Structured-Merge-Database (LSM) design with flexible tradeoffs between Write-Amplification-Factor (WAF), Read-Amplification-Factor (RAF) and Space-Amplification-Factor (SAF). It has multi-threaded compactions, making it specially suitable for storing multiple terabytes of data in a single database.

Start with example usage here: https://github.com/facebook/rocksdb/tree/master/examples

See the github wiki for more explanation.

The public interface is in include/. Callers should not include or rely on the details of any other header files in this package. Those internal APIs may be changed without warning.

Design discussions are conducted in https://www.facebook.com/groups/rocksdb.dev/

License

RocksDB is dual-licensed under both the GPLv2 (found in the COPYING file in the root directory) and Apache 2.0 License (found in the LICENSE.Apache file in the root directory). You may select, at your option, one of the above-listed licenses.